Date: Sun, 19 Mar 2006 16:46:06 +0300 From: dima <_pppp@mail.ru> To: OxY <oxy@field.hu> Cc: freebsd-net@freebsd.org Subject: Re[2]: packet drop with intel gigabit / marwell gigabit Message-ID: <E1FKyEQ-0005b8-00._pppp-mail-ru@f22.mail.ru> In-Reply-To: <001001c64a92$3ab18170$0201a8c0@oxy>
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> i increased hz from 2000 to 5000, now the packet loss is decreased > from 5-6% to 0.6-0,8% !!! > huge improve! > should i increase hz more? You can. But remember that higher HZ values spend more CPU time for task switching. So if the hardware is used for something more than only network workload you would get performance penalty in other areas. A faster CPU would be a useful option in your case (with a proper HZ increase) It seems that this card has very small buffer size. And it's nothing you can do about that. > > > ----- Original Message ----- > From: "OxY" <oxy@field.hu> > To: "Chuck Swiger" <cswiger@mac.com> > Cc: <freebsd-performance@freebsd.org> > Sent: Saturday, March 18, 2006 2:23 PM > Subject: Re: packet drop with intel gigabit / marwell gigabit > > > > currently i use HZ=2000 > > here's the output of netstat -i, -s, and vmstat -i : > > (currently i am uploading on the gigabit with ftp, 3 threads) > > > > Field root# vmstat -i > > interrupt total rate > > irq0: clk 27503959 1993 > > irq1: atkbd0 1 0 > > irq3: fxp0 2 0 > > irq7: 146 0 > > stray irq7 146 0 > > irq8: rtc 1765569 127 > > irq10: atapci1 2807786 203 > > irq11: atapci0 475039 34 > > irq13: npx0 1 0 > > irq14: ata0 99 0 > > Total 32552748 2359 > > > > Field root# netstat -i > > Name Mtu Network Address Ipkts Ierrs Opkts Oerrs > > Coll > > fxp0 1500 <Link#1> 00:a0:c9:8d:79:68 13163545 0 21899372 1 > > 0 > > fxp0 1500 195.38.96.64/ field 141 - > > 6 - - > > em0 1500 <Link#2> 00:0e:0c:a2:ac:42 68644181 4 66793904 0 > > 0 > > em0 1500 195.38.96.64/ field 211255811 - > > - - > > lo0 16384 <Link#3> 129622061 0 129622061 > > 0 0 > > > > netstat -s is here: > > http://field.hu/netstat.txt > > > > ----- Original Message ----- > > From: "Chuck Swiger" <cswiger@mac.com> > > To: "OxY" <oxy@field.hu> > > Cc: <freebsd-performance@freebsd.org> > > Sent: Saturday, March 18, 2006 1:37 PM > > Subject: Re: packet drop with intel gigabit / marwell gigabit > > > > > >> OxY wrote: > >>> yeah, i googled these settings, but i put them back to default then! > >>> i measured iperf performance, and it showed that the packet drop is > >>> depending on the system load.. > >> > >> If you are using the normal interrupt-driven configuration, you should > >> look at > >> netstat -i, -s, and vmstat -i. If you're turning on device polling, you > >> ought > >> to retry your testing at higher HZ (try 2000 or 5000): > >> > >> echo 'kern.hz="2000"' >> /boot/loader.conf > >> > >> -- > >> -Chuck > > > > _______________________________________________ > > freebsd-performance@freebsd.org mailing list > > http://lists.freebsd.org/mailman/listinfo/freebsd-performance > > To unsubscribe, send any mail to > > "freebsd-performance-unsubscribe@freebsd.org" > > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >
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